do a google search (or look on this forum) because the 6v starter and flywheel is different than the 12v stuff. if the engine starts well, so the starter doesn't get used for longer periods, then a new 6v starter will prolly be fine. if you keep the foot pedal for engaging then you don't have to worry about the bendix slamming into the ring gear either. just make sure there is the proper return spring so the starter disengages. you know all about that now.
here is a primer for you to read about the differences in starter and ring gears between the 2 systems. hope it helps.
https://talk.classicparts.com/thread...tarters.12367/